A sampling device for preventing oxidation of negative electrode electrolyte in a vanadium redox flow battery energy storage system

Abstract

This utility model discloses an anti-oxidation sampling device for the negative electrode electrolyte of a vanadium redox flow battery energy storage system, relating to the field of vanadium redox flow batteries. It includes a three-way pipe, an end cap, and a sampling assembly. The upper and lower ends of the three-way pipe are connected to pipes respectively. A valve for connecting a sampling valve is installed at the top of the upper pipe, and a manual valve is connected to the bottom of the lower pipe. A soft plug is installed in the opening at the left end of the three-way pipe, and a through hole with a diameter smaller than that of the soft plug is opened at the center of the end cap. The end cap is detachably installed at the left end of the three-way pipe. By incorporating a valve, this utility model allows the device to be directly installed at any valve position in the vanadium redox flow battery system, breaking through the dependence of traditional bypass sampling on pipe layout. This enables precise sampling and analysis of local electrolyte within the system, greatly expanding the application range of the sampling device and meeting the needs for electrolyte state assessment in different monitoring scenarios.

Description

Technical Field

[0001] This utility model belongs to the field of vanadium redox flow batteries, specifically relating to a sampling device for preventing oxidation of the negative electrode electrolyte in a vanadium redox flow battery energy storage system. Background Technology

[0002] Vanadium redox flow batteries are a new type of energy storage battery that has attracted much attention in the field of large-scale energy storage technology due to their advantages such as environmental protection, safety and flexible design. The positive and negative electrolytes are composed of strong acid solutions of vanadium ions in different valence states (V(Ⅳ) / V(Ⅴ) and V(Ⅱ) / V(Ⅲ)), respectively, and the conversion between electrical energy and chemical energy is completed by the gain and loss of electrons of vanadium ions.

[0003] The concentration of vanadium ions in different valence states in the electrolyte directly affects not only the battery's energy storage capacity but also its operating efficiency and cycle life. Therefore, accurately measuring the concentration of vanadium ions in the electrolyte is crucial for monitoring battery status and improving battery performance.

[0004] The technology disclosed in Chinese Patent Application No. 201210199067.3 involves connecting a bypass pipe in parallel with the electrolyte transmission pipe and collecting electrolyte samples on the bypass pipe. This sampling device basically meets the requirement of closed sampling to prevent oxidation of the negative electrode electrolyte. However, this method of connecting a bypass pipe in parallel with the main pipe can only be installed on the electrolyte transmission pipe, and it cannot sample and analyze the electrolyte in a localized area of ​​the flow battery system, thus having significant limitations in its application.

[0005] Therefore, we propose a sampling device for preventing oxidation of the negative electrode electrolyte in a vanadium redox flow battery energy storage system to solve the above problems. Utility Model Content

[0006] To address the limitation that this method of connecting a bypass pipe in parallel with the main pipeline can only be installed on the electrolyte transmission pipeline, making it impossible to sample and analyze the local electrolyte of the flow battery system, this invention provides an anti-oxidation sampling device for the negative electrode electrolyte of a vanadium redox flow battery energy storage system.

[0007] The solution adopted by this utility model to solve its technical problem is: a sampling device for anti-oxidation of negative electrode electrolyte in a vanadium redox flow battery energy storage system, including a three-way pipe, an end cap, and a sampling component. The upper and lower ends of the three-way pipe are respectively connected to pipes. The top end of the upper pipe is equipped with a handle for connecting a sampling valve, and the bottom end of the lower pipe is connected to a hand valve.

[0008] A soft plug is installed in the opening at the left end of the tee pipe, and a through hole is opened in the center of the end cap. The diameter of the through hole is smaller than the diameter of the soft plug. The end cap is detachably installed at the left end of the tee pipe.

[0009] The sharp end of the sampling component pierces the soft plug and extends into the three-way tube to collect the negative electrolyte inside the three-way tube.

[0010] Preferably, the valve, pipe, tee, and hand valve are all made of a material resistant to strong acid corrosion.

[0011] Preferably, the end cap is provided with connecting parts on the front and rear sides respectively, and the connecting parts are provided with bolt holes.

[0012] Preferably, it also includes an arc-shaped retaining plate, with bolt holes two at both the front and rear ends of the arc-shaped retaining plate. The arc-shaped retaining plate is sleeved on the outside of the tee pipe, and the bolt holes one and two are provided with the same bolt.

[0013] Preferably, the sampling assembly includes a sampling tube with sampling needles installed at both ends. One sampling needle is inserted into the soft plug and enters the inside of the three-way tube, while the other sampling needle is inserted into the rubber plug of the sampling tube.

[0014] Preferably, the sampling component is a syringe, with the needle of the syringe piercing the soft plug and entering the inside of the three-way tube.

[0015] Preferably, the soft plug, sampling needle, and sampling tubing are all made of a material resistant to strong acid corrosion.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. By setting a control, this utility model allows the device to be directly installed at any valve position (such as storage tank, electrolyte delivery pipeline, filter outlet, etc.) in the vanadium redox flow battery system. This breaks through the dependence of traditional bypass sampling on pipeline layout, realizes accurate sampling and analysis of local electrolyte in the system, greatly expands the application range of the sampling device, and meets the needs of electrolyte status assessment in different monitoring scenarios.

[0018] 2. This utility model, through the cooperation of the soft stopper and the sampling needle, and the sealed channel connected by the sampling hose, ensures that the negative electrode electrolyte is always isolated from the air. From the moment the sampling needle penetrates the soft stopper into the three-way tube, to the electrolyte flowing into the sampling tube through the hose, and then to the subsequent removal of the sampling needle after sampling, the entire process avoids contact between the negative electrode electrolyte and the air. This effectively prevents concentration measurement deviations of V(II) / V(III) ions caused by oxidation, providing a reliable sample basis for subsequent concentration analysis and ensuring the accuracy of battery status monitoring.

[0019] 3. This utility model uses bolts to connect the arc-shaped retaining plate and the connecting part. When the soft plug has many holes due to multiple samplings, resulting in a decrease in sealing performance, the end cover can be easily removed and a new soft plug can be replaced to ensure the long-term sealing effect of the device. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model;

[0021] Figure 2 This is a front view structural diagram of Embodiment 1 of the present utility model;

[0022] Figure 3 This utility model Figure 2 Enlarged structural schematic diagram of the frontal cross-section at point I;

[0023] Figure 4 This is a three-dimensional structural diagram of Embodiment 2 of the present invention.

[0024] In the diagram: 1. Connector; 2. Pipe; 3. Tee; 41. End cap; 42. Connector; 43. Arc-shaped retaining plate; 44. Bolt; 5. Hand valve; 61. Sampling needle; 62. Sampling hose; 7. Sampling tube; 8. Soft plug; 9. Syringe. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Please see Figure 1-4 This utility model provides a technical solution for an anti-oxidation sampling device for the negative electrode electrolyte of a vanadium redox flow battery energy storage system:

[0027] Example 1:

[0028] according to Figure 1-3 As shown, the device includes a three-way pipe 3, an end cap 41, a sampling assembly, and an arc-shaped retaining plate 43. The upper and lower ends of the three-way pipe 3 are respectively connected to pipes 2. The top of the upper pipe 2 is equipped with a connector 1 for connecting the sampling valve. By setting the connector 1, the device can be directly installed at any valve position (such as the storage tank, electrolyte delivery pipeline, filter outlet, etc.) of the vanadium redox flow battery system. This breaks through the dependence of traditional bypass sampling on the layout of pipes 2, realizes accurate sampling and analysis of local electrolyte in the system, greatly expands the application range of the sampling device, and meets the needs of electrolyte status assessment in different monitoring scenarios.

[0029] The bottom end of the lower pipe 2 is connected to a hand valve 5. By closing the hand valve 5, the electrolyte in the three-way pipe 3 will not flow out. By opening the hand valve 5, the residual electrolyte in the three-way pipe 3 can be discharged.

[0030] A soft plug 8 is installed in the opening at the left end of the three-way pipe 3. A through hole is opened at the center of the end cap 41. The diameter of the through hole is smaller than the diameter of the soft plug 8. Connecting parts 42 are respectively provided on the front and rear sides of the end cap 41. A bolt hole 1 is opened on the connecting part 42. A bolt hole 2 is opened at the front and rear ends of the arc-shaped retaining plate 43. The arc-shaped retaining plate 43 is sleeved on the outside of the three-way pipe 3. The same bolt 44 is provided in the bolt hole 1 and bolt hole 2. Under the connection of the two bolts 44, the end cap 41 can be firmly fixed to the left end of the three-way pipe 3. At the same time, it avoids the problem of the soft plug 8 being squeezed out due to excessive internal pressure in the three-way pipe 3. When the soft plug 8 has many holes due to multiple samplings, resulting in a decrease in sealing performance, the end cap 41 can be removed from the left end of the three-way pipe 3 by removing the bolts 44, and a new soft plug 8 can be replaced to ensure the long-term sealing effect of the device.

[0031] The sampling assembly includes a sampling hose 62, with sampling needles 61 installed at both ends of the sampling hose 62. One sampling needle 61 is inserted into the soft stopper 8 and into the three-way tube 3, while the other sampling needle 61 is inserted into the rubber stopper of the sampling tube 7, allowing the electrolyte to flow into the sampling tube 7 through the hose. This process avoids contact between the negative electrode electrolyte and air, effectively preventing concentration measurement deviations of V(II) / V(III) ions caused by oxidation. It provides a reliable sample basis for subsequent concentration analysis and ensures the accuracy of battery status monitoring.

[0032] The components 1, 2, 3, 4, 5, 8, 61, and 62 are all made of a material resistant to strong acid corrosion.

[0033] In practical use, the present invention provides a sampling device for anti-oxidation of negative electrode electrolyte in a vanadium redox flow battery energy storage system. First, the connecting rod 1 is connected to the target sampling valve of the battery system to ensure that the connecting rod 1 and the sampling valve are sealed and secure. Then, the hand valve 5 is confirmed to be in the closed state. Then, the sampling needles 61 at both ends of the sampling component are inserted into the soft plug 8 and penetrate into the interior of the three-way tube 3 and the rubber plug of the sampling tube 7, respectively.

[0034] Open the sampling valve, and the electrolyte flows into the three-way tube 3 under system pressure, and enters the sampling tube 7 through the sampling needle 61 and the sampling hose 62. Observe the liquid level in the sampling tube 7. Once the required sample volume is reached, immediately close the sampling valve. First, pull out the sampling needle 61 connected to the sampling tube 7, and then pull out the sampling needle 61 connected to the soft plug 8. This ensures that the electrolyte does not come into contact with air throughout the sampling process. Finally, use the manual valve 5 to drain the remaining electrolyte in the three-way tube 3.

[0035] Example 2:

[0036] Based on Example 1, such as Figure 4As shown, the sampling component is a syringe 9. The needle of the syringe 9 is inserted into the soft stopper 8 and enters the three-way tube 3. After the syringe 9 draws a certain amount of electrolyte, the needle of the syringe 9 is inserted into the rubber stopper of the sampling tube 7 to push the electrolyte into the sampling tube 7.

Claims

1. A negative electrolyte anti-oxidation sampling device for a vanadium redox flow battery energy storage system, comprising a tee, an end cap, and a sampling assembly, characterized in that: The upper and lower ends of the tee are respectively connected to pipes. The top end of the upper pipe is equipped with a mandrel for connecting to the sampling valve, and the bottom end of the lower pipe is connected to a hand valve. A soft plug is installed in the opening at the left end of the tee pipe, and a through hole is opened in the center of the end cap. The diameter of the through hole is smaller than the diameter of the soft plug. The end cap is detachably installed at the left end of the tee pipe. The sharp end of the sampling component pierces the soft plug and extends into the three-way tube to collect the negative electrolyte inside the three-way tube.

2. The negative electrolyte anti-oxidation sampling device for a vanadium flow battery energy storage system according to claim 1, characterized in that: The valves, pipes, tees, and hand valves are all made of materials resistant to strong acid corrosion. 3.The negative electrolyte sampling device for vanadium redox flow battery energy storage system according to claim 1, characterized in that: The end cap is provided with connecting parts on the front and rear sides respectively, and a bolt hole is provided on the connecting parts.

4. The anti-oxidation sampling device for the negative electrode electrolyte of the all-vanadium redox flow battery energy storage system according to claim 3, characterized in that: It also includes an arc-shaped retaining plate, with bolt holes two at both the front and rear ends of the arc-shaped retaining plate. The arc-shaped retaining plate is fitted onto the outside of the tee pipe, and the same bolt is installed in bolt holes one and two.

5. The anti-oxidation sampling device for the negative electrode electrolyte of the all-vanadium redox flow battery energy storage system according to claim 1, characterized in that: The sampling assembly includes a sampling tube with sampling needles installed at both ends. One sampling needle is inserted into the soft plug and enters the three-way tube, while the other sampling needle is inserted into the rubber plug of the sampling tube.

6. The anti-oxidation sampling device for the negative electrode electrolyte of the all-vanadium redox flow battery energy storage system according to claim 1, characterized in that: The sampling component is a syringe, and the needle of the syringe pierces the soft plug and enters the inside of the three-way tube.

7. The anti-oxidation sampling device for the negative electrode electrolyte of the all-vanadium redox flow battery energy storage system according to claim 5, characterized in that: The soft plug, sampling needle, and sampling tubing are all made of materials resistant to strong acid corrosion.

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